本文实例讲述了JS实现Fisheye效果动感放大菜单代码。分享给大家供大家参考，具体如下：
这款Fisheye Menu，是采用JS+CSS+XHTML实现的动感放大菜单，放到图标上的时候，图标会被放大，整个菜单有缓冲弹簧的效果，学jQuery的朋友见的比较多，不过本款没有用到jQuery，效果却同样精彩。
运行效果截图如下：
在线演示地址如下：
http://demo.maopiaopiao.com/js/2015/js-fisheye-style-menu-demo/
具体代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Fisheye 动感放大的菜单</title>
<style>
#fisheye_menu {
list-style: none;
padding: 0;
margin: 10px;
height: 81px;
}
#fisheye_menu li {
position: relative;
display: block;
float: left;
}
#fisheye_menu span {
position: absolute;
top: 100%;
left: 0;
text-align: center;
width: 79px;
padding: 1px;
margin: 0;
border: solid 1px #bbb;
color: #333;
background: #eee;
}
#fisheye_menu a {
text-decoration: none;
}
#fisheye_menu img {
border: 0;
vertical-align: top;
}
</style>
<script type='text/javascript'>
var fisheyemenu = {
startSize : 55,
endSize : 88,
imgType : ".gif",
init : function () {
var animElements = document.getElementById("fisheye_menu").getElementsByTagName("img");
var titleElements = document.getElementById("fisheye_menu").getElementsByTagName("span");
for(var j=0; j<titleElements.length; j++) {
titleElements[j].style.display = 'none';
}
for(var i=0; i<animElements.length; i++) {
var y = animElements[i];
y.style.width = fisheyemenu.startSize+'px';
y.style.height = fisheyemenu.startSize+'px';
fisheyemenu.imgSmall(y);
animElements[i].onmouseover = changeSize;
animElements[i].onmouseout = restoreSize;
}
function changeSize() {
fisheyemenu.imgLarge(this);
var x = this.parentNode.getElementsByTagName("span");
x[0].style.display = 'block';
if (!this.currentWidth) this.currentWidth = fisheyemenu.startSize;
fisheyemenu.resizeAnimation(this,this.currentWidth,fisheyemenu.endSize,15,10,0.333);
}
function restoreSize() {
var x = this.parentNode.getElementsByTagName("span");
x[0].style.display = 'none';
if (!this.currentWidth) return;
fisheyemenu.resizeAnimation(this,this.currentWidth,fisheyemenu.startSize,15,10,0.5);
fisheyemenu.imgSmall(this);
}
},
resizeAnimation : function (elem,startWidth,endWidth,steps,intervals,powr) {
if (elem.widthChangeMemInt) window.clearInterval(elem.widthChangeMemInt);
var actStep = 0;
elem.widthChangeMemInt = window.setInterval(
function() {
elem.currentWidth = fisheyemenu.easeInOut(startWidth,endWidth,steps,actStep,powr);
elem.style.width = elem.currentWidth+"px";
elem.style.height = elem.currentWidth+"px";
actStep++;
if (actStep > steps) window.clearInterval(elem.widthChangeMemInt);
}
,intervals)
},
easeInOut : function (minValue,maxValue,totalSteps,actualStep,powr) {
var delta = maxValue - minValue;
var stepp = minValue+(Math.pow(((1 / totalSteps)*actualStep),powr)*delta);
return Math.ceil(stepp)
},
imgSmall : function (obj) {
imgSrc = obj.getAttribute("src");
var typePos = imgSrc.indexOf(fisheyemenu.imgType, 0);
var imgName = imgSrc.substr(0, typePos);
obj.setAttribute("src", imgName+"_small"+fisheyemenu.imgType);
},
imgLarge : function (obj) {
imgSrc = obj.getAttribute("src");
var typePos = imgSrc.indexOf("_small", 0);
var imgName = imgSrc.substr(0, typePos);
obj.setAttribute("src", imgName+fisheyemenu.imgType);
}
}
if ( typeof window.addEventListener != "undefined" )
window.addEventListener( "load", fisheyemenu.init, false );
else if ( typeof window.attachEvent != "undefined" )
window.attachEvent( "onload", fisheyemenu.init );
else {
if ( window.onload != null ) {
var oldOnload = window.onload;
window.onload = function ( e ) {
oldOnload( e );
fisheyemenu.init();
};
}
else
window.onload = fisheyemenu.init;
}
</script>
</head>
<body>
<div>
<ul id="fisheye_menu">
<li><a href="#1"><img src="images/icon.gif" alt="毛票票" /><span>Icon 1</span></a></li>
<li><a href="#2"><img src="images/icon2.gif" alt="image description" /><span>Icon 2</span></a></li>
<li><a href="#3"><img src="images/icon.gif" alt="脚本下载" /><span>Icon 3</span></a></li>
<li><a href="#4"><img src="images/icon2.gif" alt="image description" /><span>Icon 4</span></a></li>
<li><a href="#5"><img src="images/icon.gif" alt="maopiaopiao.com" /><span>Icon 5</span></a></li>
<li><a href="#6"><img src="images/icon2.gif" alt="image description" /><span>Icon 6</span></a></li>
</ul>
</div>
</body>
</html>
希望本文所述对大家JavaScript程序设计有所帮助。